--- parser3/src/main/pa_sql_driver_manager.C 2001/04/04 11:47:29 1.2 +++ parser3/src/main/pa_sql_driver_manager.C 2020/12/10 23:21:09 1.99 @@ -1,155 +1,285 @@ /** @file Parser: sql driver manager implementation. - Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) - - Author: Alexander Petrosyan (http://design.ru/paf) - - $Id: pa_sql_driver_manager.C,v 1.2 2001/04/04 11:47:29 paf Exp $ + Copyright (c) 2001-2017 Art. Lebedev Studio (http://www.artlebedev.com) + Author: Alexandr Petrosian (http://paf.design.ru) */ -#include "pa_config_includes.h" -#include "ltdl.h" #include "pa_sql_driver_manager.h" +#include "ltdl.h" +#include "pa_threads.h" #include "pa_sql_connection.h" #include "pa_exception.h" #include "pa_common.h" +#include "pa_vhash.h" +#include "pa_vtable.h" +#include "pa_charsets.h" + +volatile const char * IDENT_PA_SQL_DRIVER_MANAGER_C="$Id: pa_sql_driver_manager.C,v 1.99 2020/12/10 23:21:09 moko Exp $" IDENT_PA_SQL_DRIVER_MANAGER_H IDENT_PA_SQL_CONNECTION_H; // globals -SQL_Driver_manager *SQL_driver_manager; +SQL_Driver_manager* SQL_driver_manager=0; // consts -const int MAX_PROTOCOL=20; -const char *LIBRARY_CREATE_FUNC_NAME="create"; +const time_t EXPIRE_UNUSED_CONNECTION_SECONDS=60; +const time_t CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2; -// url: -// protocol://user:pass@host:port/database -// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ this is driver-dependent -SQL_Connection& SQL_Driver_manager::get_connection(const String& url, - Table *protocol2library) { - SYNCHRONIZED(true); +// helpers - Pool& pool=url.pool(); // request pool +const String& SQL_Driver_services_impl::url_without_login() const { + String& result=*new String; + result << furl->mid(0, furl->pos(':')) << "://****"; + + size_t at_pos=0; + size_t new_at_pos; + while( (new_at_pos=furl->pos('@', at_pos+1))!=STRING_NOT_FOUND) + at_pos=new_at_pos; + if(at_pos) + result << furl->mid(at_pos, furl->length()); - // we have table for locating protocol's library - if(!protocol2library) - PTHROW(0, 0, - &url, - "SQL:drivers table must be defined"); + return result; +} - // first trying to get cached connection - if(SQL_Connection *result=get_connection_from_cache(url)) - return *result; - // no cached connection - - int pos=url.pos("://", 3); - if(pos<0) - PTHROW(0, 0, - &url, - "no protocol specified"); // NOTE: not THROW, but PTHROW - - // make url string on global pool - char *url_cstr=(char *)malloc(MAX_STRING); - strncpy(url_cstr, url.cstr(String::UL_AS_IS), MAX_STRING); - - char *protocol_cstr=lsplit(&url_cstr, ':'); - String& protocol=*new(this->pool()) String(this->pool(), protocol_cstr); +void SQL_Driver_services_impl::transcode(const char* src, size_t src_length, + const char*& dst, size_t& dst_length, + const char* charset_from_name, + const char* charset_to_name + ) +{ + try { + // to speed up sql transcode [lots of charsets::get-s -- twice for each cell] + // without complicating sql driver API + // we need to cache couple of name->charset pairs + // assuming pointers to names are are NOT to local vars + + struct cache_record { + const char* name; + Charset* object; + } cache[2]={{0,0}, {0,0}}; + + Charset* charset_from_object; + Charset* charset_to_object; + if(charset_from_name==cache[0].name) { + charset_from_object=cache[0].object; + } else { + cache[0].name=charset_from_name; + cache[0].object=charset_from_object=&pa_charsets.get_direct(charset_from_name); + } + if(charset_to_name==cache[1].name) { + charset_to_object=cache[1].object; + } else { + cache[1].name=charset_to_name; + cache[1].object=charset_to_object=&pa_charsets.get_direct(charset_to_name); + } + + String::C result=Charset::transcode(String::C(src, src_length), *charset_from_object, *charset_to_object); + dst=result.str; + dst_length=result.length; + } catch(const Exception& e) { + _throw(SQL_Error(e.type(), e.comment())); + } catch(...) { + _throw(SQL_Error("unknown error while transcoding in sql driver")); + } +} - // skip // after : - while(*url_cstr=='/') - url_cstr++; - - SQL_Driver *driver; - // first trying to get cached driver - if(!(driver=get_driver_from_cache(protocol))) { - // no cached - const String *library=0; - if(protocol2library->locate(0, protocol)) { - if(!(library=protocol2library->item(1)) || library->size()==0) - PTHROW(0, 0, - protocol2library->origin_string(), - "library column for protocol '%s' is empty", protocol_cstr); - } else - PTHROW(0, 0, - &url, - "undefined protocol '%s'", protocol_cstr); - - const char *filename=library->cstr(String::UL_FILE_NAME); - lt_dlhandle handle=lt_dlopen(filename); - if (!handle) - PTHROW(0, 0, - library, - "can not open the module, %s", lt_dlerror()); - - SQL_Driver_create_func create=(SQL_Driver_create_func)lt_dlsym(handle, - LIBRARY_CREATE_FUNC_NAME); - if(!create) - PTHROW(0, 0, - library, - "function '%s' was not found", LIBRARY_CREATE_FUNC_NAME); - - // create library-driver! - driver=(*create)(); - - // validate driver api version - int driver_api_version=driver->api_version(); - if(driver_api_versiontop_index(); i++) + expire_connection(*stack->get(i), older_dies); +} + +// SQL_Driver_manager + +SQL_Driver_manager::SQL_Driver_manager(): prev_expiration_pass_time(0) {} + +SQL_Driver_manager::~SQL_Driver_manager() { + connection_cache.for_each(expire_connections, time(0)+(time_t)10/*=in future=expire all*/); +} + +/// @param aurl protocol://[driver-dependent] +SQL_Connection* SQL_Driver_manager::get_connection(const String& aurl, Table *protocol2driver_and_client, const char* arequest_charset, const char* adocument_root) { + // we have table for locating protocol's library + if(!protocol2driver_and_client) + throw Exception(PARSER_RUNTIME, &aurl, "$" MAIN_SQL_NAME ":" MAIN_SQL_DRIVERS_NAME " table must be defined"); + + // first trying to get cached connection + SQL_Connection* connection=get_connection_from_cache(aurl); + if(connection) { + connection->set_url(); + if(!connection->ping()) { // we have some cached connection, is it pingable? + connection->disconnect(); // kill unpingabe=dead connection + connection=0; + } } + + char *url_cstr; + if(connection) + url_cstr=0; // calm, compiler + else { // no cached connection or it were unpingabe: connect/reconnect + url_cstr=aurl.cstrm(); + if(!strstr(url_cstr, "://")) + throw Exception(PARSER_RUNTIME, aurl.length()?&aurl:0, "connection string must start with protocol://"); + + + char *protocol_cstr=lsplit(&url_cstr, ':'); + // skip "//" after ':' + while(*url_cstr=='/') + url_cstr++; + const String& protocol=*new String(protocol_cstr); + + SQL_Driver *driver; + // first trying to get cached driver + if(!(driver=get_driver_from_cache(protocol))) { + // no cached + const String* library=0; + const String* dlopen_file_spec=0; + Table::Action_options options; + if(protocol2driver_and_client->locate(0, protocol, options)) { + if(!(library=protocol2driver_and_client->item(1)) || library->length()==0) + throw Exception(PARSER_RUNTIME, 0, "driver library column for protocol '%s' is empty", protocol_cstr); + dlopen_file_spec=protocol2driver_and_client->item(2); + } else + throw Exception(PARSER_RUNTIME, &aurl, "undefined protocol '%s'", protocol_cstr); + + pa_dlinit(); + + const char* filename=library->taint_cstr(String::L_FILE_SPEC); + lt_dlhandle handle=lt_dlopen(filename); + if (!handle) { + const char* error=lt_dlerror(); + throw Exception(0, library, error ? error : "can not open the module"); + } + + SQL_Driver_create_func create=(SQL_Driver_create_func)(lt_dlsym(handle, + SQL_DRIVER_CREATE_NAME)); + if(!create) + throw Exception(0, library, "function '" SQL_DRIVER_CREATE_NAME "' was not found"); + + // create library-driver! + driver=(*create)(); + + // validate driver api version + int driver_api_version=driver->api_version(); + if(driver_api_version!=SQL_DRIVER_API_VERSION) + throw Exception(0, library, "driver implements API version 0x%04X not equal to 0x%04X", driver_api_version, SQL_DRIVER_API_VERSION); + + // initialise by connecting to sql client dynamic link library + char* dlopen_file_spec_cstr= + dlopen_file_spec && dlopen_file_spec->length()? + dlopen_file_spec->taint_cstrm(String::L_AS_IS):0; + if(const char* error=driver->initialize(dlopen_file_spec_cstr)) + throw Exception(0, library, "driver failed to initialize client library '%s', %s", dlopen_file_spec_cstr ? dlopen_file_spec_cstr : "unspecifed", error); + + // cache it + put_driver_to_cache(protocol, driver); + } - return *new(this->pool()) SQL_Connection(url.pool(), //< associate with request - *driver, url_cstr, url); -} + connection=new SQL_Connection(aurl, *driver, arequest_charset, adocument_root); + // associate with pool[request] (deassociates at close) + connection->set_url(); + } -void SQL_Driver_manager::close_connection(const String& url, - SQL_Connection& connection) { - SYNCHRONIZED(true); + // if not connected yet, do that now, when connection has services + if(!connection->connected()) + connection->connect(url_cstr); + // return autoclosing object for it + return connection; +} - connection.set_pool(0); // deassociate from request +void SQL_Driver_manager::close_connection(connection_cache_type::key_type url, SQL_Connection* connection) { put_connection_to_cache(url, connection); } // driver cache -SQL_Driver *SQL_Driver_manager::get_driver_from_cache(const String& protocol) { - if(SQL_Driver *result=static_cast(driver_cache.get(protocol))) - return result; +SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) { + SYNCHRONIZED; - return 0; + return driver_cache.get(protocol); } -void SQL_Driver_manager::put_driver_to_cache(const String& protocol, - SQL_Driver& driver) { - driver_cache.put(protocol, &driver); +void SQL_Driver_manager::put_driver_to_cache(driver_cache_type::key_type protocol, driver_cache_type::value_type driver) { + SYNCHRONIZED; + + driver_cache.put(protocol, driver); } // connection cache - -SQL_Connection *SQL_Driver_manager::get_connection_from_cache(const String& url) { - if(Stack *connections=static_cast(connection_cache.get(url))) - if(connections->size()) // there are cached connections to that 'url' - return static_cast(connections->pop()); +/// @todo get rid of memory spending Stack [zeros deep inside got accumulated] +SQL_Connection* SQL_Driver_manager::get_connection_from_cache(connection_cache_type::key_type url) { + SYNCHRONIZED; + + if(connection_cache_type::value_type connections=connection_cache.get(url)) + while(!connections->is_empty()) { // there are cached connections to that 'url' + SQL_Connection* result=connections->pop(); + if(result->connected()) // not expired? + return result; + } return 0; } -/// @todo cache expiration[use SQL_Driver::disconnect], pinging. -void SQL_Driver_manager::put_connection_to_cache(const String& url, - SQL_Connection& connection) { - Stack *connections; - if(!(connections=static_cast(connection_cache.get(url)))) { - // there are no cached connections to that 'url' yet - connections=NEW Stack(pool()); // NOTE: never freed up! +void SQL_Driver_manager::put_connection_to_cache(connection_cache_type::key_type url, SQL_Connection* connection) { + SYNCHRONIZED; + + connection_cache_type::value_type connections=connection_cache.get(url); + if(!connections) { // there are no cached connections to that 'url' yet? + connections=new connection_cache_element_base_type; connection_cache.put(url, connections); } - connections->push(&connection); + connections->push(connection); +} + +void SQL_Driver_manager::maybe_expire_cache() { + time_t now=time(0); + + if(prev_expiration_pass_time(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS)); + + prev_expiration_pass_time=now; + } +} + +static void add_connection_to_status_cache_table(SQL_Connection& connection, Table* table) { + if(connection.connected()) { + ArrayString& row=*new ArrayString; + + // url + row+=&connection.services().url_without_login(); + // time + time_t time_used=connection.get_time_used(); + row+=new String(pa_strdup(ctime(&time_used))); + + *table+=&row; + } +} +static void add_connections_to_status_cache_table(SQL_Driver_manager::connection_cache_type::key_type /*key*/, SQL_Driver_manager::connection_cache_type::value_type stack, Table* table) { + for(Array_iterator i(*stack); i.has_next(); ) + add_connection_to_status_cache_table(*i.next(), table); +} + +Value* SQL_Driver_manager::get_status() { + Value* result=new VHash; + + // cache + { + ArrayString& columns=*new ArrayString; + columns+=new String("url"); + columns+=new String("time"); + Table& table=*new Table(&columns, connection_cache.count()); + + connection_cache.for_each(add_connections_to_status_cache_table, &table); + + result->get_hash()->put(*new String("cache"), new VTable(&table)); + } + + return result; }